[ExI] Fermi question, possible answer

[Tomaz Kristan]

This is perhaps clearer, why a faster rotating planet is warmer, everything
else equal.

https://protokol2020.wordpress.com/2013/07/02/faster-is-hotter-in-planetary-rotation-really/

On Sat, Apr 4, 2015 at 6:35 PM, Tomaz Kristan <protokol2020 at gmail.com>
wrote:

> Faster rotation is a cause of warming. Please see why.
>
> https://protokol2020.wordpress.com/2013/07/04/planet-rotation-extreme-case/
>
> On Sat, Apr 4, 2015 at 6:09 PM, John Clark <johnkclark at gmail.com> wrote:
>
>>
>> On Sat, Apr 4, 2015 Tomaz Kristan <protokol2020 at gmail.com> wrote:
>>
>> > What is known as the faint sun paradox - why was so warm on Earth back
>>> when our Sun was much fainter
>>>
>>
>> Even more paradoxical is that 3 billion years ago on Mars, which is
>> further from that fainter sun than the Earth, it was warm enough for liquid
>> water to exist on it's surface. It's odd.
>>
>>
>>> > has a strange answer. Be cause our planet rotated faster!
>>>
>>
>> Earth once rotated in less than 6 hours but back then the moon was much
>> closer and it's tidal forces slowed the rotation to 24 hours and is still
>> slowing it down; but angular momentum must be conserved so as the Earth
>> slows down the moon goes further away. Mars has no large moon to slow it
>> down and yet strangely it has almost the same rotational period as the
>> Earth. Coincidence I guess.
>>
>>
>>> > Yes, that's right. A faster rotating planet is warmer!
>>>
>>
>> I have heard that global warming could increase the rotation of the Earth
>> because water expands when it gets warmer and water would tend to move from
>> the equator to the poles, but it's a very small effect, less than a millisecond;
>> and the faster rotation is a effect of warming not a cause.
>>
>>   John K Clark
>>
>>
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>>
>
>
> --
> https://protokol2020.wordpress.com/
>



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